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• W1608203707 endingPage "255" @default.
• W1608203707 startingPage "242" @default.
• W1608203707 abstract "Calcanei of mature mule deer have the largest mineral content (percent ash) difference between their dorsal ‘compression’ and plantar ‘tension’ cortices of any bone that has been studied. The opposing trabecular tracts, which are contiguous with the cortices, might also show important mineral content differences and microscopic mineralization heterogeneity (reflecting increased hemi-osteonal renewal) that optimize mechanical behaviors in tension vs. compression. Support for these hypotheses could reveal a largely unrecognized capacity for phenotypic plasticity – the adaptability of trabecular bone material as a means for differentially enhancing mechanical properties for local strain environments produced by habitual bending. Fifteen skeletally mature and 15 immature deer calcanei were cut transversely into two segments (40% and 50% shaft length), and cores were removed to determine mineral (ash) content from ‘tension’ and ‘compression’ trabecular tracts and their adjacent cortices. Seven bones/group were analyzed for differences between tracts in: first, microscopic trabecular bone packets and mineralization heterogeneity (backscattered electron imaging, BSE); and second, trabecular architecture (micro-computed tomography). Among the eight architectural characteristics evaluated [including bone volume fraction (BVF) and structural model index (SMI)]: first, only the ‘tension’ tract of immature bones showed significantly greater BVF and more negative SMI (i.e. increased honeycomb morphology) than the ‘compression’ tract of immature bones; and second, the ‘compression’ tracts of both groups showed significantly greater structural order/alignment than the corresponding ‘tension’ tracts. Although mineralization heterogeneity differed between the tracts in only the immature group, in both groups the mineral content derived from BSE images was significantly greater (P < 0.01), and bulk mineral (ash) content tended to be greater in the ‘compression’ tracts (immature 3.6%, P = 0.03; mature 3.1%, P = 0.09). These differences are much less than the approximately 8% greater mineral content of their ‘compression’ cortices (P < 0.001). Published data, suggesting that these small mineralization differences are not mechanically important in the context of conventional tests, support the probability that architectural modifications primarily adapt the tracts for local demands. However, greater hemi-osteonal packets in the tension trabecular tract of only the mature bones (P = 0.006) might have an important role, and possible synergism with mineralization and/or microarchitecture, in differential toughening at the trabeculum level for tension vs. compression strains." @default.
• W1608203707 created "2016-06-24" @default.
• W1608203707 creator A5020121921 @default.
• W1608203707 creator A5037099989 @default.
• W1608203707 creator A5047212633 @default.
• W1608203707 creator A5070900247 @default.
• W1608203707 date "2012-01-06" @default.
• W1608203707 modified "2023-10-16" @default.
• W1608203707 title "Do regional modifications in tissue mineral content and microscopic mineralization heterogeneity adapt trabecular bone tracts for habitual bending? Analysis in the context of trabecular architecture of deer calcanei" @default.
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